31316729243 has 8 divisors (see below), whose sum is σ = 31773927600. Its totient is φ = 30860293248.

The previous prime is 31316729221. The next prime is 31316729363. The reversal of 31316729243 is 34292761313.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31316729243 - 2¹⁴ = 31316712859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31316729243.

It is not an unprimeable number, because it can be changed into a prime (31316789243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107573 + ... + 272406.

It is an arithmetic number, because the mean of its divisors is an integer number (3971740950).

Almost surely, 2^31316729243 is an apocalyptic number.

31316729243 is a deficient number, since it is larger than the sum of its proper divisors (457198357).

31316729243 is a wasteful number, since it uses less digits than its factorization.

31316729243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381181.

The product of its digits is 163296, while the sum is 41.

The spelling of 31316729243 in words is "thirty-one billion, three hundred sixteen million, seven hundred twenty-nine thousand, two hundred forty-three".